In this work a gliding arc plasmatron consisting of a filamentary discharge rotating in a nitrogen vortex flow at low DC current ( I = 100 mA) is investigated. The gas flow swirl of the plasmatron is produced by six tangential gas inlets. The Reynolds number of the nitrogen flow through these tubes at the flow rate of Q = 10 slm amounts to about 2400, which is in the intermediate range. Under these conditions, the formation of micro-vortices can be caused by small gas flow disturbances like e.g. a tube edge. The operation of the GA plasmatron at these conditions is accompanied by the production of plasma spots at the anode surface, namely near the gas inlets. Melted and solidified metal is found in erosion traces left by plasma spots at the anode surface. It is established that melting of stainless steel cannot be caused by an axial current of I = 100 mA of plasma spots and an helical current is supposed. This assumption is confirmed by microscope images of e...

中文翻译：

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小电流滑弧等离子加速器阳极斑点

在这项工作中，研究了由在低直流电流（I = 100 mA）下在氮气涡流中旋转的丝状放电组成的滑弧等离子加速器。等离子加速器的气流旋流由六个切向进气口产生。以Q = 10 slm的流速流经这些管的氮气的雷诺数约为2400，处于中间范围。在这些条件下，微涡流的形成可能是由较小的气流干扰（例如管边缘）引起的。在这些条件下，GA等离子加速器的运行会伴随在阳极表面（即进气口附近）产生等离子斑。在阳极表面的等离子体斑点留下的腐蚀痕迹中发现了熔化和凝固的金属。可以确定的是，不能由等离子点的I = 100 mA的轴向电流引起不锈钢熔化，而应假定为螺旋电流。该假设已被电子显微镜的图像证实。